CN104566462B - A kind of premixing nozzle and gas turbine - Google Patents
A kind of premixing nozzle and gas turbine Download PDFInfo
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- CN104566462B CN104566462B CN201410843197.5A CN201410843197A CN104566462B CN 104566462 B CN104566462 B CN 104566462B CN 201410843197 A CN201410843197 A CN 201410843197A CN 104566462 B CN104566462 B CN 104566462B
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Abstract
The present invention relates to chain drive technical field, and in particular to a kind of premixing nozzle and gas turbine.The premixing nozzle includes centerbody, annular inner wall, annular outer wall and swirl-flow devices, and independent diffusion fuel passage is formed between annular inner wall and annular outer wall.Fuel in diffusion fuel passage is divided to two strands：One is directly axially injected into burner inner liner by ignition fuel injections hole, and local low regime or recirculating zone can be formed in the downstream of steady fiery bluff body；Another stock is directly radially injected into the low regime or recirculating zone in steady fiery bluff body downstream by steady fiery fuel orifice；Steady fiery bluff body and the fuel of steady fiery fuel orifice injection enhance the stability of flame, final realization is more reliably ignited and the premixed flame of stabilized nozzle, to improve the ignition performance of premixing nozzle, simultaneously, due to being the structure improvement to nozzle exit, the effect of structure easy processing maintenance is realized.
Description
Technical field
The present invention relates to chain drive technical field, more particularly to a kind of premixing nozzle and gas turbine, and in particular to
A kind of premixing nozzle for improving ignition performance.
Background technology
With the attention of energy scarcity and the whole world to environmental protection problem, various countries discharge and fired to gas-turbine combustion chamber
It is more and more stricter to burn the requirement of efficiency, typically requires that gas turbine can maintain in 50% and above load setting, combustion chamber discharge
In reduced levels, while keep higher efficiency of combustion.In order to reach the purpose of low emission, premixed combustion technology is adopted extensively
With.Therefore, nozzle needs to realize being pre-mixed for fuel and air, and is formed well mixed in nozzle exit and have a constant speed
The fuel-air mixture of degree type, and then enter and burning is participated in burner inner liner.
It is extremely low to reach because the fuel that is ejected from premixing nozzle is burnt in a manner of premixed flame in combustion chamber
Disposal of pollutants, the fuel-air mixture body effluxvelocity that flame is operated in flammable border nearby and nozzle ejects is larger, combustion
The reliable ignition for burning room is relatively difficult, and it is typically that centerbody axial length is less than premixing nozzle to solve method in the prior art
The length of outside wall surface so that fuel-air mixture body from annular premixed channel flow out when first to centerbody head end wall downstream
Central area expand, centerbody head end wall downstream central area formed recirculating zone, subsequently into burner inner liner in flame
Further expanded in cylinder, and then larger recirculation zone is formed in burner inner liner, for the stabilization of flame, but the two recirculating zones
Easily by the influence of other air-flows in burner inner liner, this method is simple next from the air angle for forming stable recirculating zone in domain
Improve the stability of premixed flame, it is contemplated that what it is into recirculating zone is still fuel-air not fire-hazardous, that equivalent proportion is relatively low
Gaseous mixture, combustion chamber still have the successful risk that can not light a fire.
In order to improve the stability of flame, in existing patent document (CN1704574), employ in premixing nozzle outlet
Heart body nearby manufactures flows shock air flow in opposite direction with main flow, forms recycling vortex, reduces and be ejected into backflow
Air capacity in area, so as to reduce premixing nozzle near exit effluxvelocity, improve flame holding.Come from air angle
See, this premixing nozzle is the stability for improving local return area, simply has certain effect to the stabilization of flame, can not can
Improve the ignition performance of premixing nozzle by ground, and from the point of view of processing technology angle, the structure such as this premixing nozzle internal layer baffle plate adds
Work connection etc. is complex, and is not easy to maintenance and changes.
Therefore, it is insufficient, it is necessary to a kind of premixing nozzle and gas turbine for improving ignition performance for more than.
The content of the invention
(1) technical problems to be solved
The technical problem to be solved in the present invention is to provide a kind of premixing nozzle and gas turbine, the premixing nozzle can be effective
Improve ignition performance.
(2) technical scheme
In order to solve the above-mentioned technical problem, the present invention, which provides premixing nozzle, includes centerbody, annular inner wall and swirl-flow devices,
The annular inner wall is co-axially located at the periphery of centerbody, and the swirl-flow devices are described between centerbody and annular inner wall
The periphery of annular inner wall is coaxially provided with annular outer wall, and diffusion fuel passage is formed between the annular inner wall and annular outer wall；
The diffusion fuel passage connects with collection chamber, and the annular inner wall is provided with steady fiery bluff body, and the collection chamber is communicated with igniting
Fuel orifice and steady fiery fuel orifice, the ignition fuel injections hole is towards the ignition zone of burner inner liner, the steady fire combustion
Expect spray-hole towards the downstream area of steady fiery bluff body.
Wherein, the collection chamber is surrounded by jet expansion end wall and jet expansion internal ring wall；The jet expansion inner ring
Wall is located between jet expansion end wall and steady fiery bluff body；The ignition fuel injections hole is opened on jet expansion end wall, described
Steady fiery fuel orifice is opened on jet expansion internal ring wall.
Wherein, the centerbody end is provided with centerbody head end wall, and the centerbody head end wall is provided with center
Air jet hole；The steady fiery bluff body is located at the downstream of centerbody head end wall.
Wherein, the steady fiery bluff body is along the circumferentially disposed of annular inner wall, and the circumferential scope of steady fiery bluff body is no more than annular
The half of inwall circumference.
Wherein, the shape of cross section of the steady fiery bluff body is triangle or rectangle or trapezoidal or circular arc.
Wherein, the circumferential scope that the ignition fuel injections hole and steady fiery fuel orifice open up is no more than steady fiery bluff body
Circumferential scope.
Wherein, the ignition fuel injections hole and steady fiery fuel orifice are straight hole or inclined hole.
Wherein, the perforated area ratio of the ignition fuel injections hole and steady fiery fuel orifice is between 0.5-10.
Wherein, the swirl-flow devices include being provided with leaf along the circumferentially disposed swirl vane of centerbody, the swirl vane
Piece inner passage, teasehole is provided with the blade interior passage, is provided with the centerbody and the blade interior passage
The premix fuel channel of connection.
The present invention also provides a kind of gas turbine, and it includes described premixing nozzle.
(3) beneficial effect
The above-mentioned technical proposal of the present invention has the advantages that：The present invention provides a kind of premixing nozzle, by pre-
Independent diffusion fuel passage is set on mix nozzle ring wall, part of fuel is injected directly into flame from ignition fuel injections hole
Cylinder, drastically increase the ignition performance of premixing nozzle；Moreover, by being set on annular inner wall face of the nozzle close to exit
Bluff body structure, so as to form stable recirculating zone, and part of fuel is returned after being injected directly into bluff body in diffusion fuel passage
Area is flowed, forms stable steady flame range domain, it substantially increases the stability of flame close to the position in ignition fuel injections hole, and
Further increase the ignition performance of nozzle.The premixing nozzle is simple in construction, easily realizes, and not by combustion chamber miscellaneous part
Limitation, the problems such as matching.
Brief description of the drawings
Fig. 1 is the structural representation of premixing nozzle of the embodiment of the present invention；
Fig. 2 is the close-up schematic view of premixing nozzle of embodiment of the present invention outlet；
Fig. 3 is the front schematic view of premixing nozzle of the embodiment of the present invention；
Fig. 4 is the stereogram of premixing nozzle of the embodiment of the present invention；
Fig. 5 is the use state diagram of premixing nozzle of the embodiment of the present invention.
Wherein, 1：Centerbody；2：Annular inner wall；3：Annular outer wall；4：Swirl-flow devices；5：Swirl vane；6：Centerbody head
Portion's end wall；7：Steady fiery bluff body；8：Jet expansion end wall；9：Jet expansion internal ring wall；10：Premix fuel channel；11：Diffused fuel
Passage；12：Blade interior passage；13：Premix fuel orifice；14：Collection chamber；15：Ignition fuel injections hole；16：Steady fire combustion
Expect spray-hole；17：Steady flame range after bluff body；18：Center air spray-hole；19：Premixing nozzle；20：Burner inner liner wall；21：Igniting
Device；22：Spark.
Embodiment
Embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples.Following examples are used for
Illustrate the present invention, but can not be used for limiting the scope of the present invention.
In the description of the invention, unless otherwise indicated, " multiple " are meant that two or more；Term " on ",
" under ", "left", "right", " interior ", " outer ", " front end ", " rear end ", " head ", the orientation of the instruction such as " afterbody " or position relationship be
Based on orientation shown in the drawings or position relationship, it is for only for ease of the description present invention and simplifies description, rather than instruction or dark
Show that the device of meaning or element there must be specific orientation, with specific azimuth configuration and operation, thus it is it is not intended that right
The limitation of the present invention.In addition, term " first ", " second ", " the 3rd " etc. be only used for describe purpose, and it is not intended that instruction or
Imply relative importance.
In the description of the invention, it is necessary to which explanation, unless otherwise clearly defined and limited, term " connected ", " connects
Connect " it should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or it is integrally connected；It can be machine
Tool connects or electrical connection；Can be joined directly together, can also be indirectly connected by intermediary.For this area
For those of ordinary skill, the concrete meaning of above-mentioned term in the present invention can be understood with concrete condition.
As Figure 1-5, the present embodiment premixing nozzle includes centerbody 1, annular inner wall 2 and swirl-flow devices 4, annular inner wall
2 are co-axially located at the periphery of centerbody 1, and swirl-flow devices 4 are between centerbody 1 and annular inner wall 2 and close to the import of centerbody 1
One end, for producing rotational flow air；Moreover, annular outer wall 3 is coaxially provided with the periphery of annular inner wall 2, and in annular inner wall 2
Diffusion fuel passage 11 is formed between annular outer wall 3；Moreover, diffusion fuel passage 11 connects with collection chamber 14.Meanwhile in ring
Shape inwall 2 is provided with steady fiery bluff body 7, and the collection chamber 14 is located at the terminal position of premixing nozzle, and is communicated with ignition fuel injections
Hole 15 and steady fiery fuel orifice 16.Wherein, ignition zone (that is, igniter fuel of the ignition fuel injections hole 15 towards burner inner liner
The opening direction of spray-hole 15 is axially consistent with the premixing nozzle), corresponding, steady fiery fuel orifice 16 is towards steady fiery bluff body
7 downstream area (that is, the opening direction of steady fiery fuel orifice 16 and premixing nozzle radially consistent).
As shown in Fig. 2 collection chamber 14 is surrounded by jet expansion end wall 8 and jet expansion internal ring wall 9, and positioned at premix spray
The end of mouth.Wherein, jet expansion internal ring wall 9 is located between jet expansion end wall 8 and steady fiery bluff body 7.Moreover, steady fiery fuel spray
Perforation 16 is opened on jet expansion internal ring wall 9, and makes downstream area of the steady fiery fuel orifice 16 towards steady fiery bluff body 7；Together
When, ignition fuel injections hole 15 is opened on jet expansion end wall 8, and makes igniting of the ignition fuel injections hole 15 towards burner inner liner
Region.
Steady fiery fuel orifice 16 can make part of fuel be injected directly into the local low regime in the steady fiery downstream of bluff body 7 or return
Area is flowed, so as to form local fuel rich area, it is easier to the diffusion fire that the fuel that ignited fuel orifice 15 sprays is formed
Flame ignites, and flame can stablize the steady flame range 17 after region formation bluff body.
In addition, being provided with centerbody head end wall 6 in the end of centerbody 1, centerbody head end wall 6 is provided with center air
Spray-hole 18；Steady position of the fiery bluff body 7 between centerbody head end wall 6 and jet expansion end wall 8.Certainly, center air
The form of spray-hole 18 can be straight hole, inclined hole and tangential hole.
For steady fiery bluff body 7, as shown in Figure 3, Figure 4, it can be along the circumferentially disposed of annular inner wall 2, and steady fiery bluff body 7
Circumferential scope be not more than the circumference of annular inner wall 2 half.That is, steady fiery bluff body 7 is in arcuation on annular inner wall 2
Distribution, the arc length are not more than the half of the circumference of annular inner wall 2, in other words, angle corresponding to steady fiery bluff body 7 (- 90 °~+
90 °) between.
Moreover, multiple ignition fuel injections holes 15 and steady fiery fuel orifice 16 are similarly circumferentially set, Liang Zhekai
If circumferential scope be no more than the circumferential scope of steady fiery bluff body 7, i.e. ignition fuel injections hole 15 and steady fiery fuel orifice 16
Arrangement scope fall within the scope of the circumference of steady fiery bluff body 7.
Preferably, the shape of cross section of steady fiery bluff body 7 is triangle or rectangle or trapezoidal or circular arc.Certainly, other shapes
The steady fiery bluff body 7 of shape falls within protection scope of the present invention.
Further, ignition fuel injections hole 15 and steady fiery fuel orifice 16 can be straight hole or inclined hole, wherein, straight hole is
The through hole opened up vertically, inclined hole are the through hole opened up vertically with the direction vector of radial direction, meanwhile, ignition fuel injections hole 15
It can also be the tangential hole for passing through fuel rotation with steady fiery fuel orifice 16, can also be other kinds of hole certainly,
For example, bellmouth etc..
In addition, the perforated area ratio of ignition fuel injections hole 15 and steady fiery fuel orifice 16 is between 0.5-10, herein
In the range of disclosure satisfy that the demand of igniting and steady fire.
Wherein, swirl-flow devices 4 include being provided with blade along the circumferentially disposed swirl vane 5 of centerbody 1, swirl vane 5
Portion's passage 12, and teasehole 13 is provided with blade interior passage 12, it is provided with centerbody 1 and is connected with blade interior passage 12
Premix fuel channel 10.
In addition, the present invention also provides a kind of gas turbine, it includes described premixing nozzle, and the premixing nozzle is being installed
When, the installation site of igniter 21 on the side face burner inner liner wall 20 where steady fiery bluff body 7 need to be ensured, i.e. steady fiery bluff body 7
Close to the side that igniter 21 is installed.
The operation principle of the present invention is as follows：First, the independent expansion that fuel is formed by annular inner wall 2 and annular outer wall 3
Dissipate fuel channel 11 to enter in the collection chamber 14 of jet expansion end wall 8, fuel is divided into two strands from collection chamber 14, this two bursts combustions
Material is not pre-mixed with air, and wherein one passes through the ignition fuel injections hole 15 that is opened up on jet expansion end wall 8
It is injected directly into burner inner liner；Steady fiery bluff body 7 is provided with the annular inner wall 2 of the upstream of jet expansion end wall 8, in steady fiery bluff body 7
Downstream can form local low regime or recirculating zone, be provided with jet expansion inner ring between jet expansion end wall 8 and steady fiery bluff body 7
Wall 9, another strand of fuel are injected directly into the part by the steady fiery fuel orifice 16 opened up on jet expansion internal ring wall 9
Low regime or recirculating zone.
As shown in figure 5, premixing nozzle 19 is when mounted, ensure the side face burner inner liner wall 20 where steady fiery bluff body 7
The installation site of upper igniter 21, i.e., steady fiery bluff body 7 is close to the side that igniter 21 is installed, ignition fuel injections hole 15 and steady fire
The circumferential scope of fuel orifice 16 is no more than the circumferential scope of steady fiery bluff body 7 so that ejects in ignition fuel injections hole 15
Fuel closer to igniter 21, and fuel is not pre-mixed with air so that fuel is easier what ignited device 21 manufactured
Spark 22 is lighted.
The fuel that part is not pre-mixed with air is injected directly into the steady fiery downstream of bluff body 7 from steady fiery fuel orifice 16
Local low regime or recirculating zone, form local fuel rich area, it is easier to the fuel that ignited fuel orifice 15 sprays
The diffusion flame pilot of formation, and flame can be stablized in the region, form steady flame range 17 after bluff body.
The space that air is limited by centerbody 1 and annular inner wall 2 flows into nozzle interior, and is formed by swirl-flow devices 4
The air-flow of rotational flow, the blade interior passage 12 that fuel enters in swirl vane 5 from premix fuel channel 10, and out of blade
The premix fuel orifice 13 set on portion's passage 12 is spouting；Air and fuel mix in the location of swirl-flow devices 4,
Fuel-air mixture is ignited in the low regime in the steady fiery downstream of bluff body 7 or recirculating zone, forms stable premixed flame, until pre-
The fuel-air mixer of mix nozzle 19 is all ignited, and is stably lighted a fire successfully in specific position.
After lighting a fire successfully, it can lead to according to flame stabilization and the actual requirement of disposal of pollutants, selective closing diffused fuel
Road 11；Meanwhile the center air spray-hole 18 that centerbody 1 opens up in head end wall 6 has air stream to go out, to reach to wall herein
The cooling effect in face.
In summary, the present invention provides a kind of premixing nozzle, by setting independent diffusion to fire on premixing nozzle ring wall
Expect passage, part of fuel is injected directly into burner inner liner from ignition fuel injections hole, drastically increase the point of premixing nozzle
Fiery performance；Moreover, by setting bluff body structure on annular inner wall face of the nozzle close to exit, so as to form stable backflow
Area, and part of fuel can be injected directly into recirculating zone after bluff body in diffusion fuel passage, form stable steady flame range domain, its is tight
The position of adjoint point fire fuel orifice, substantially increases the stability of flame, and further increases the ignition performance of nozzle.Should
Premixing nozzle is simple in construction, easily realizes, and is not limited by combustion chamber miscellaneous part, the problems such as matching.
Embodiments of the invention provide for the sake of example and description, and are not exhaustively or by this to send out
It is bright to be limited to disclosed form.Many modifications and variations are obvious for the ordinary skill in the art.Choosing
Select and describe embodiment and be to more preferably illustrate the principle and practical application of the present invention, and make one of ordinary skill in the art
It will be appreciated that the present invention is so as to designing the various embodiments with various modifications suitable for special-purpose.
Claims (10)
1. a kind of premixing nozzle, including centerbody (1), annular inner wall (2) and swirl-flow devices (4), the annular inner wall (2) is coaxial
The periphery of centrally disposed body (1), the swirl-flow devices (4) are located between centerbody (1) and annular inner wall (2), and its feature exists
In：The periphery of the annular inner wall (2) is coaxially provided with annular outer wall (3), the annular inner wall (2) and annular outer wall (3) it
Between formed diffusion fuel passage (11)；The diffusion fuel passage (11) connects with collection chamber (14), on the annular inner wall (2)
Provided with steady fiery bluff body (7), the collection chamber (14) is communicated with ignition fuel injections hole (15) and steady fiery fuel orifice (16), institute
State ignition zone of the ignition fuel injections hole (15) towards burner inner liner, the steady fiery steady fiery bluff body of fuel orifice (16) direction
(7) downstream area.
2. premixing nozzle according to claim 1, it is characterised in that the collection chamber (14) passes through jet expansion end wall
(8) surrounded with jet expansion internal ring wall (9)；The jet expansion internal ring wall (9) is located at jet expansion end wall (8) and steady fiery bluff body
(7) between；The ignition fuel injections hole (15) is opened on jet expansion end wall (8), the steady fiery fuel orifice (16)
It is opened on jet expansion internal ring wall (9).
3. premixing nozzle according to claim 2, it is characterised in that centerbody (1) end is provided with centerbody head
Portion's end wall (6), the centerbody head end wall (6) are provided with center air spray-hole (18)；During the steady fiery bluff body (7) is located at
The downstream of heart body head end wall (6).
4. premixing nozzle according to claim 1, it is characterised in that the steady week of the fiery bluff body (7) along annular inner wall (2)
To setting, and the circumferential scope of steady fiery bluff body (7) is not more than the half of annular inner wall (2) circumference.
5. premixing nozzle according to claim 1, it is characterised in that the shape of cross section of the steady fiery bluff body (7) is three
Angular or rectangle or trapezoidal or circular arc.
6. premixing nozzle according to claim 1, it is characterised in that the ignition fuel injections hole (15) and steady fiery fuel
The circumferential scope that spray-hole (16) opens up is no more than the circumferential scope of steady fiery bluff body (7).
7. premixing nozzle according to claim 1, it is characterised in that the ignition fuel injections hole (15) and steady fiery fuel
Spray-hole (16) is straight hole or inclined hole.
8. premixing nozzle according to claim 1, it is characterised in that the ignition fuel injections hole (15) and steady fiery fuel
The perforated area ratio of spray-hole (16) is between 0.5-10.
9. premixing nozzle according to claim 1, it is characterised in that the swirl-flow devices (4) were included along centerbody (1) week
To the swirl vane (5) of setting, the swirl vane (5) is provided with blade interior passage (12), the blade interior passage
(12) teasehole (13) is provided with, the premix combustion connected with the blade interior passage (12) is provided with the centerbody (1)
Expect passage (10).
10. a kind of gas turbine, it is characterised in that including premixing nozzle as claimed in any one of claims 1-9 wherein.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410843197.5A CN104566462B (en) | 2014-12-30 | 2014-12-30 | A kind of premixing nozzle and gas turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410843197.5A CN104566462B (en) | 2014-12-30 | 2014-12-30 | A kind of premixing nozzle and gas turbine |
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| Publication Number | Publication Date |
|---|---|
| CN104566462A CN104566462A (en) | 2015-04-29 |
| CN104566462B true CN104566462B (en) | 2018-02-23 |
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| CN201410843197.5A Active CN104566462B (en) | 2014-12-30 | 2014-12-30 | A kind of premixing nozzle and gas turbine |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109579000A (en) * | 2018-12-18 | 2019-04-05 | 黄超源 | A kind of burner for liquid fuel range |
| CN114459055B (en) * | 2022-01-25 | 2023-05-12 | 哈尔滨工业大学 | Multilayer orifice plate type premixed gas turbine combustor |
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| EP0620403A1 (en) * | 1993-04-08 | 1994-10-19 | ABB Management AG | Mixing and flame stabilizing device in a combustion chamber with premixing combustion |
| CN1095463A (en) * | 1993-03-18 | 1994-11-23 | 株式会社日立制作所 | The apparatus and method of gaseous fuel and air mixed combustion |
| US6070411A (en) * | 1996-11-29 | 2000-06-06 | Kabushiki Kaisha Toshiba | Gas turbine combustor with premixing and diffusing fuel nozzles |
| CN101387410A (en) * | 2007-08-21 | 2009-03-18 | 通用电气公司 | Fuel nozzle and diffusion tip therefor |
| CN102418928A (en) * | 2010-09-27 | 2012-04-18 | 通用电气公司 | Fuel nozzle assembly for gas turbine system |
| CN204438184U (en) * | 2014-12-30 | 2015-07-01 | 北京华清燃气轮机与煤气化联合循环工程技术有限公司 | A kind of premixing nozzle and gas turbine |
-
2014
- 2014-12-30 CN CN201410843197.5A patent/CN104566462B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1095463A (en) * | 1993-03-18 | 1994-11-23 | 株式会社日立制作所 | The apparatus and method of gaseous fuel and air mixed combustion |
| EP0620403A1 (en) * | 1993-04-08 | 1994-10-19 | ABB Management AG | Mixing and flame stabilizing device in a combustion chamber with premixing combustion |
| US6070411A (en) * | 1996-11-29 | 2000-06-06 | Kabushiki Kaisha Toshiba | Gas turbine combustor with premixing and diffusing fuel nozzles |
| CN101387410A (en) * | 2007-08-21 | 2009-03-18 | 通用电气公司 | Fuel nozzle and diffusion tip therefor |
| CN102418928A (en) * | 2010-09-27 | 2012-04-18 | 通用电气公司 | Fuel nozzle assembly for gas turbine system |
| CN204438184U (en) * | 2014-12-30 | 2015-07-01 | 北京华清燃气轮机与煤气化联合循环工程技术有限公司 | A kind of premixing nozzle and gas turbine |
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| CN104566462A (en) | 2015-04-29 |
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